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Why does "ip address show" show an UNKNOWN state for some of my interfaces on System z?

Solution Verified - Updated 2016-12-04T22:54:53+00:00 -

Issue

When running the command ip address show on Red Hat Enterprise Linux for System z, some of the interfaces show UNKNOWN as their state even when the interface is UP

Environment

Red Hat Enterprise Linux 6 for system z
qeth driver

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